There is a broken tooth on a plastic gear of my PlayStation's transport. Anyone knows what I can use to rebuild it?

I was thinking to make a mold with the other teeth, turn the gear and fill something inside. Now the problem is -what- do I put in there. I know that normally crazyglue and plastic powder works but there will be a mold in there and I don't have any plastic powder.

Wouldn't a little 30minute epoxy filled with chopped nylon or fiberglass
be the ticket? both are pretty readily available.

Plastic gears are often made of self lubricating, very difficult to bond to,
nylon or polyethylene - like the bottle that superglue comes in. You might have some luck seriously roughing up the exposed surfaces or drilling a lot of tiny holes into it.